#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define USER "USER"

int main()
{
    char* who = getenv(USER);
    if(strcmp(who,"root")==0)
    {
        printf("user:%s\n",who);
        printf("user:%s\n",who);
        printf("user:%s\n",who);
        printf("user:%s\n",who);
        printf("user:%s\n",who);
    }
    else
    {
        printf("权限不足\n");
    }
    
    return 0;
}
